Hitachi NV 65AH User guide

MODEL NV 65AH

1. DISASSEMBLY AND REASSEMBLY

The items particularly necessary for disassembly and reassembly are described below. The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded assembly diagram.

[CAUTION]

z#Before disassembly or reassembly, be sure to disconnect the air hose from the nailer (with your finger released from the trigger) to exhaust all the compressed air and remove all nails.

1-1. General Precautions in Disassembly and Reassembly

z#Apply grease (Nippeco SEP-3A, Code No.930035) to the o-rings and o-rings’ sliding portion. When installing the o-rings, be careful not to damage the o-rings and prevent dirt entry.

z#Oil required: Hitachi pneumatic tool lubricant

1 oz (30 cc) Oil feeder (Code No.877153)

4 oz (120 cc) Oil feeder (Code No.874042)

1 quart (1ltr) Can (Code No.876212)

z#If the Gasket [6] is damaged, replace it and check that no air is leaking.

z#Be especially careful to prevent the entry of foreign particles into the control valve section. z#Tightening torque for each part

Bolt, screw and cap		Tightening torque
		[N·m (kgf·cm, ft-lbs)]
Nylock High Tension Bolt M6	[30]	16.2±1.5 (165±15, 11.9±1.1)
Hex. Socket Hd. Bolt M6	[1], [43]	12.7±0.8	(130±8, 9.4±0.6)
Hex. Socket Hd. Bolt M5	[4]	8.3±0.5	(85±5, 6.1±0.4)
Nylock Hex. Socket Hd. Bolt M4	[102]	4.4±0.3	(45±3, 3.2±0.2)
Hex. Socket Hd. Bolt M4	[90]	4.4±0.3	(45±3, 3.2±0.2)
Machine Screw M5	[44]	2.0±0.5	(20±5, 1.5±0.4)
Machine Screw M4	[87]	0.5 - 1.0 (5 - 10, 0.36 - 0.72)
Cap	[49]	24.5±4.9 (250±50, 18±3.6)

− 1 −

2-2. Disassembly and Reassembly of the Output Section

(1)Disassembly and reassembly of the Exhaust Cover [5], the Head Valve [10], the Exhaust Valve Rubber

(A) [7], etc. (See Fig. 12A and Fig. 12B)

	Hex. Socket Hd. Bolt	[Tools required]
		z#Hex. bar wrench (5 mm and 4 mm)
	M6 x 16 [1]
	Plate [2]	z#Hammer
	Top Cover [3]	(a) Disassembly
		z#Remove the four Hex. Socket Hd. Bolts M5 x 35 [4] with
	Hex. Socket Hd. Bolt	a hex. bar wrench (4 mm). The entire Exhaust Cove r [5]
	M5 x 35 [4]	can now be removed from the Body Ass’y [23].
		z#Remove the Hex. Socket Hd. Bolt M6 x 16 [1] with a hex.
	Exhaust Cover [5]	bar wrench (5 mm). The Plate [2] and Top Cover [3] can
		now be removed.
	Gasket [6]	z#As shown in Fig. 12B, insert a 4 to 5 mm (0.157² to
		0.197²) dia. bar into the M6 screw hole in the Exhaust
		Cover [5] and force out Exhaust Valve Rubber (A) [7]
	Exhaust Valve	with a hammer. Now, the parts forming the Exhaust
		Cover [5] can be taken out.
	Rubber (A) [7]
		[CAUTION]
		Do not use a pointed bar or a bar with a diameter of
	Head Valve Spring [8]	less than 4 mm (0.157²) to prevent damage to Exhaust
		Valve Rubber (A) [7].

O-Ring (S-34) [9]

		Hammer
	Head Valve [10]
	Cylinder O-Ring (C)
	(I.D 44.7) [11]
		Exhaust Cover [5]	Force out
	Head Valve		4 to 5 mm dia. bar
			(0.157²to 0.197²)
	Rubber [12]	Exhaust
		Valve
		Rubber
		(A)[7]
	Body Ass’y [23]

Fig. 12A Disassembly and reassembly of the	Fig. 12B
exhaust cover, head valve, exhust valve
rubber (A), etc.

− 2 −

Exhaust Valve Rubber (A) [7]

Head Valve [10]

Exhaust
Cover [5]	Push in

Charge with 3

grams of grease. Push in until the rubber is fully seated over the projection.

Fig. 13

(b) Reassembly

Disassembly procedures should be followed in the reverse order. Note the following points:

z#Lubricate the sliding portion of the Head Valve [10] in the Exhaust Cover [5] with about 3 grams of grease and apply grease to each surface of the O-Ring [9] [11].

z#As shown in Fig. 13, firmly push in Exhaust Valve Rubber (A) [7] until it is fully seated over the projection of the Exhaust Cover [5].

(2) Disassembly and reassembly of the Cylinder [17], the Piston [20], the Piston Bumper [26], etc.

(See Fig. 14)

Piston Ring [18]

O-Ring (I.D 34.2) [9]

Piston [20]

Retaining Ring [13]

Cylinder Plate [14]

Cylinder O-ring (I.D 63.1) [15]

Cylinder O-ring (C)

(I.D 44.7) [11]

Concave

O-ring (P-46) [16]

Cylinder [17]

Retaining ring detaching groove

Piston Bumper [26]

When assembling, push in the Cylinder Plate [14] until the Retaining Ring [13] is surely seated in the groove in the Body Ass’y [23] .

Body Ass’y [23]

Fig.14 Disassemblyandreassemblyofthe

Cylinder, Piston, Pistonbumper, etc.

[Tools required]

z#Hex. bar wrench (4 mm) z#Flatblade head screwdriver

(a) Disassembly

z#Remove the Exhaust Cover [5] as described in section (1), remove the Retaining Ring [13] in the Body Ass’y [23], insert the blade of the screwdriver into the retaining ring detaching groove in the Body Ass’y [23], and remove the Retaining Ring [13]. Now, the Cylinder [17], the Cylinder Plate [14], the Piston [20], the Piston Bumper [26], etc. can be taken out.

(b)Reassembly

Disassembly procedures should be followed in the

reverse order. Note the following points: z#Apply the supplied oil (Hitachi pneumatic tool

lubricant) to the Piston Ring [18], the O-Rinq (I.D 34.2) [19], and the internal side of the Cylinder

[17].

z#Apply grease to the Cylinder O-Ring (I.D 63.1) [15], the Cylinder O-Ring (C) (I.D 44.7) [11] and install. z#Facing the concave side of the Cylinder Plate [14] upward, fit and push the Cylinder [17] in the Body Ass’y [23] until the Retaining Ring [13] is correctly

seated in the groove of the Body Ass’y. z#Remember that when putting the Retaining Ring

[13] into the groove of the Body Ass’y [23], the opening of the Retaining Ring [13] must not overlap with the retaining ring detaching groove.

− 3 −

1-3.Disassembly and Reassembly of the Control Valve Section (See Fig. 15)

Retaining Ring (E-type) for D6 Shaft [21]

Body Ass’y [23]

[Tools required]

z#Flatblade head screwdriver

Roll Pin z#Roll pin puller (3 mm dia.) D3 x 28 [51] z#Hex. bar wrench (4 mm)

Trigger (A) [52]

Trigger Pin [53]

Head Valve O-ring (I.D 16.8) [55]

Valve Bushing (B) [56]

O-ring (S-18) [57]

O-ring (I.D 8.8) [58]

O-ring (I.D 11) [59]

O-ring (S-4) [60]

Valve Piston (B) [61]

Plunger Spring [62]

Plunger (A) [63]

O-ring (I.D l.8) [64]

Valve Bushing (A) [65]

Fig. 15 Disassembly and reassembly of the control valve section

(a) Disassembly

z#Remove the Retaining Ring (E-Type) for D6 Shaft

[21] with the blade of a screw driver and remove the Triqger Pin [53], and Trigger (A) [52] can be removed.

z#To remove Trigger (A) [52] together with the driving Section (Pushing Lever (B) [37], the Nose

[29] ,etc.), remove Trigger (A) [52] while forcing down Plunger (A) [63] with the blade of a screwdriver, as shown in Fig. 16.

Remove

Push Lever (B) [37]

Trigger (A) [52]

Force down

Plunger (A) [63]

Screwdriver

Fig. 16

− 4 −

Push

Body Ass’y [23]

Head Valve O-Ring (I.D 16.8) [55]

Valve Bushing

(B) [56]

Valve Piston (B) [61]

Valve Bushing (A) [65]

Plunger (A) [63]

When disassembling, do not pull out this part by gripping it with the pliers.

Fig. 17

Valve Bushing (B) [56]

Hole

Be careful not to

	Wire with 1.5 to 3 mm dia.	damage the internal
	(0.059² to 0.118²)
		surface.

z#Pull out the Roll Pin D3 x 28 [51] with the roll pin puller (3 mm dia.), and take out the control valve in the following manner.

1)Remove the Exhaust Cover [5] by following the procedure in (1), section 1-2.

2)As shown in Fig. 17, put a 4 to 5 mm (0.157 to 0.197²) dia. bar in from the upper

side of the Body Ass’y [23] and push the top of Valve Piston (B) [61]. Now, the parts forming the control valve can be taken out except Valve Bushing (A) [65] and the Head Valve O-Ring (I.D 16.8)

[55].

[CAUTIONS]

z#Be careful not to damage Valve Piston (B) [61], Valve Bushing (A) [65] and (B) [56], etc.

z#Do not pull out the end of Plunger (A) [63] with pliers.

3)To take out Valve Bushing (B) [56], put a 1.5 to 3 mm (0.059² to 0.118²) dia. wire

with its end hooked into the hole in the bushing and pull it out while being careful not to damage the internal surface of Valve Bushing (B) [56], as shown in

Fig. 18.

Fig. 18

− 5 −